Introduction -- Providing for the "common defence" : the original understanding -- The gloss of history : an introduction to the separation of national security powers -- The president's national security powers -- Congress's national security powers -- The courts' national security powers -- The domestic effect of international law -- The right to wage war (jus ad bellum) -- International humanitarian law (jus in bello) -- How we go to war : lessons from Vietnam -- The war powers resolution -- Collective self-defense -- Unilateral self-defense and rescue -- Targeting terrorists -- Humanitarian and peace operations -- Organization and authority of the intelligence community -- Covert actions in principle and practice -- Defying oversight? dirty assets, special military operations, and contractors -- Organizing for intelligence collection -- The Fourth Amendment and national security -- Congressional authority for foreign intelligence surveillance.